Anonymous
Guest
Has anyone had this happen?
My 74 Norton has a single Amal MK2 installed. When the engine is nicely warmed up, after maybe 5 to 10 miles, the throttle begins to stick. It begins with a little twitch then progresses to the throttle sticking open, not responding to the twistgrip being returned. Snapping the twistgrip and popping the clutch does no good. It won't be idled while running and will only function normally when the engine is shut down and allowed to cool. As soon as it heats up again, sticking starts all over again. If turned off while hot then restarted, it operates fine up to about 2500 RPM then sticks open once that threshold is passed. Cruising down the road at a steady 5K RPM is exciting to say the least.
I've checked the cable linkage and the twist grip and they seem to be operating with very little friction. I suspect that the carburetor throat is warping slightly when the engine/carb heats up and the warping is causing the slide to stick open.
I've tried a new slide spring and a new chrome slide but it's still not working.
Any ideas?
Gene
My 74 Norton has a single Amal MK2 installed. When the engine is nicely warmed up, after maybe 5 to 10 miles, the throttle begins to stick. It begins with a little twitch then progresses to the throttle sticking open, not responding to the twistgrip being returned. Snapping the twistgrip and popping the clutch does no good. It won't be idled while running and will only function normally when the engine is shut down and allowed to cool. As soon as it heats up again, sticking starts all over again. If turned off while hot then restarted, it operates fine up to about 2500 RPM then sticks open once that threshold is passed. Cruising down the road at a steady 5K RPM is exciting to say the least.
I've checked the cable linkage and the twist grip and they seem to be operating with very little friction. I suspect that the carburetor throat is warping slightly when the engine/carb heats up and the warping is causing the slide to stick open.
I've tried a new slide spring and a new chrome slide but it's still not working.
Any ideas?
Gene